Electric motor.



E. ARNOLD & J. L. LA OOUR.

ELECTRIC MOTOR. APYLIOATIOHI FILED 001'. 5, 1908.

970,412. Patented Sept 13, 1910.

' vwwnbow abfozn e139 Q r I 970,412

formers. A single coil .traiisforrner NT is connected across the powerterminals and the pressures of the main stator winding and of the shuntcircuit are regulated by means of the respective contacts K and K' Thetransformer ST supplies the current ,to the auxiliary stator. Winding,the

primary coil being in-series with the rotor and the number of primaryturns of the transformer being regulated by means of the contact K" inorder to vary and re verse the ampere turns of the auxiliary 'wlndlng.

In the construction shown in Figs. 2 and 3 the speed is varied byvarying and reversing the ampere turns of the auxiliary winding HW, andin order to bring about the proper saturation ofthe stator core thevoltage per turn of the stator winding is varied.

This is accomplished in Fig. 2 by varying p the number of turns, thevoltage remaining constant, and in Fig. 3 by varying the wit age,.thenumber of turns remaining constant.

Both constructions are also provided with means for adjusting the properelectrometive force impressed upon the rotor winding.

, Instead of' using movable contactsthe variable windings shown in Figs.2 and 3' may in a practical arrangement'be subdivided in a certainnumber of parts, which can be connected up in different ways forvarying-the number and direction of their ampere turns in the mannershown in our application Serial Number 260,521. 3

In accordance" with this invention the speed is varied primarily byvarying the ampere turns of the auxiliary winding, and

the proper magnetic saturation of thestator core and, therefore, aproper counter E. M.

F. of the stator winding is obtained by vary ing the voltage per turn ofthe main stator winding. In this way a'large Wattless ,cur-

rentis avoided. The proper magnetic saturation of the stator core is inthe particular embodiment obtained by varying the voltage per turn ofthe main stator wind1ng,-and this 1s accomplished by varying the numberof turns, or by varyin the impressed voltage.

The function, therefore, of this variation of the voltage per turn ofthe stator winding is not primarily to vary the s eed of the n1otor, forthis is accomplished y the auxiliary winding, but its fu'nctionis tocontrolthe magnetic saturation of the stator core, and

therefore, the counter electromotive' force sive flow of current, o

In the arrangement shown in Fig. 2, the

auxiliary cross-fieId stator winding HW is (so directly connectedin'series with the rotor on the axis of the brushes B B while in Figs.v1 and 2, this stator winding is inductively connected in series withvthe rotor through the series transformer ST. 7 There 5 is thus a seriesconnection between the windaxis of the. auxiliary field, means of thestator winding, and thus avoid excesing HW an the. brushes in the withthe magnetic axis thereof in each ofthe ar rangements illustrated andmeans for vary ing the ampere turns of this winding to control the-crossileld and. the torque of the motor.

Having thus described the invention what is claimed is,

1. In an alternating current motor, in combination, a rotorwindingprovidedwith a commutator, brushes bearing on the come i mutator, a setof said brusl'ies connected. to a source of current andforrningtheexcit' ing circuit, a second set of said brushes short circuiting therotor winding on a line dis 30 placed from the first set and forming thecon'lpensat-ing circuit, and stator windings including a main portlonarranged to produce a magnetization along the line of the second set ofbrushes, and an auxiliary par- 35 tion connected in series with thefirst set of brushes and arranged to produce a magnetization along theline of the first set of brushes, the circuit containing the auxiliaryportion and first set oi brushes being cone 9o nected in shunt to themain portion across" said source oicurrent.

2. In an alternating current motor, in combination, a stator windinghaving con motions for supplying current thereto, said on windingcomprising main and auxiliary coils whose magnetic fields are inqlnulratinre, a rotor having a winding provided with a commutator, a setof connected brushes bearing-on said commutator and short-cir 10ocuiting the rotorwinding on theaxis of the main field to compensate themain field, an, other of brushes bearin on the com-. mutator andconnected in series circuit with the auxiliary stator coil to a sourceof current to produce a magnetization along the whereby the ampereturnsof the auxiliary winding may be varied, and means whereby thevoltage impressed upon the main stator winding may be varied.

-3. In an alternating current motor in combination, a stator windinghaving connections for supplyingcurrent. thereto, said windin rcomprisin main and auxiliary coils w ose ma 1et1c fields are inquadra--' ture, a rotor having a winding provided with a commutator, aset of connected brushes bearing on said commutator and slim-heir}cuiting the rotor winding on the axis ofthe main held to compensate themainfield, an other set of brushesbearing on the comma tator andconnected in series circuit with the'auxiliar stator coil to a source ofbar rentto roduce a magnetization alon the 1% axis of t e auxiliaryfield, and means w rereby the voltage impressed upon the auxiliarystator windin may be varied. J

4. In an a ternating current motor, in

combination, a rotor Winding provided with v'aried.

a commutator, brushes bearing on the (our mutator, a set of said brushesconnected to a source of current and torn'nng the exciting circuit, asecond set of said brushes short circuiting the rotp'r winding on a linedisplaced. from the first set and forming the compensatin circuit, amain stator winding aranged to produce a magnetization on the line ofthe second set of brushes, an auxiliary stator winding arranged toproduce a magnetization along the line of the first set of brushes, andmeans whereby the magnetic saturation of the stator core may be controlled. v

'5. In an alternating current motor in combination, a rotor windingprovided with. a. commutator, brushes bearing on the commutator, a setof said brushes connected to a source of current and forming theexciting circuit, a second set of said brushes short circuiting therotor winding on a line displaced from the first set and forming thecompensating circuit, a main stator winding arranged to produce amagnetization on the line of the second set. of brushes, an auxiliarystator winding arranged to produce a ma iet-ization along the line ofthe first set of rushes, and means whereby the VOlfH B per turn of themain stator winding may )e I 6. In an alternating current motor in.combination, a rotor windingprovided with a commutator, brushes bcarmgon the commutator, a set of said brushes connected to a source ofcurrent and forming the exciting circuit, a second set of said brushesshort circuiting the rotor winding-on a line displaced frointhe firstset and forming the compensating" circuit, a main stator windingarranged to produce a magnetization on the line of the second setofbrushes, an auxiliary stator winding arra'ngedto produce amagnetization along the li'neof the first set of brushes, meansWherebythe ampere turns of the auxiliary winding may be varied, andmeans whereby the voltage per turn of the main winding may be: varied.

7". In an alternating current motor in combination, a rotor windingprovided with a commutator, brushes bearing on the com. mutator, a setof said hrushes'connected to a source of current and forming theexciting circuit, 'a second set of said brushes short circuiting therotor winding on a line displaced from the first set and forming thecompensatmg circuit, a main stator winding arranged to produce amagnetization on the line of the second set of rushes, an auxiliarystator winding arranged to produce a ma netization along the line of thefirst brushes, means whereby the ampere turnsojffthe auxiliary windingmay be re- .ye'rsed and means whereby the voltage per turnof. the [mainstator-grinding may be varied;

8. In an alternating current motor in combination, a main stator windingconnected to a source of current, a rotor winding provided with acommutator, brushes bearing on said commutator, a set of said brushesconnected together on the line of magnctizi'v tion of the main statorwinding so as to set up a field to compensate said main stator winding,another set of said brushes conconnected together on the line ofmagnetization at an angle to the main stator winding, an auxiliarystator winding connected in circuit with the second set of brushes andarranged to produce a magnetization. along the line of the second set ofbrushes, the circult containing the auxiliary winding and the second setof brushes being connected in shunt with the main stator winding, andmeans whereby thevoltage per turn of the main stator winding may beVaried.

9. In an alternating current motor in combination, a main stator windingconnected to a source of current, a rotor winding provided with acommutator, brushes bearing on said commutator, a set of said brushesconnected together on the line of magnetization of the main statorwinding so as to set up a field to compensate said main stator winding,another set of said brush-es connccted to said source to produce amagnet i'zation at an angle to the main stator winding, an auxiliarystator winding connected in circuit with the second set of brushes andarranged to produce a magnetization along the line of the second set ctbrushes, the circuit containing the auxiliary winding and the secondsetof brushes being connected in shunt with the main stator winding,means whereby the voltage per turn of the main stator winding may bevaried, and means whereby the ampere turns of the auxiliary winding maybe varied.

1.0; In an alternating current motor in combination, a main statorwinding connected to a source of current, a rotor Windingprovided withacommutator, brushes bearing on; said commutator, a set of said brushesconnected together on the line of brushes and arran ed to produce amagnet-'- ization along the line'ot the second set of brushes, thecircuit containin the auxiliary winding and the second set 0 brushesbeing connected in shunt with the main stator winding, means whereby thevoltage per turn of the main stator winding maybe varied, andmeanswhereby the ampere turns of the auxiliary winding may be reversed11.--In an alternating current motor In -winding, and means combination,a main stator winding connected to a source of current, a rotor windingprovided with a commutator, brushes bearing on said commutator, a set ofsaid brushes connected together on the line of" 1nagn'etization of themain stator winding so as to set up a field to compensate said mainstator winding, another set of said brushes connected to said source toproduce a magnetization at an angle to the main stator winding, anauxiliary stator winding epnnected in circuit with the second set of.brushes and arranged to produce a magnetization along the line of thesecond set of brushes, the circuit containin the auxiliary winding andthe second set 0? brushes being connected. in shunt with the main statorWinding, and means-whereby the voltage impressed upon the circuitcontaining the second set of brushes may be varied,

12. In an alternating current motor in combination, a main statorwinding connected to a source of current, a rotor winding provided witha commutator, brushes caring on said commutator, a set of said brushesconnected together on the line of magnetization of the main statorwinding sons to setlupa field 'to'compensate said main-stator winding,another set of-said brushes connected 'to said source to produce amagnetization at an angle to the main stator winding, an auxiliarystator winding connected in circuit with the id set of brushes andarranged to produce a imigneti [zatimi along the line of the second setof brushes, the circuit containing the auxiliary winding and the secondsetof brushes being connected inv shunt with the main stator whereby theampere turns of the auxiliary winding may be varied. 13. In analternating current motor in combination, a main stator windingconnectedtoa source of current, a rotor winding provided with acommutator, brushes bearing on said-commutator, a set of said brushesconnected together on the line of inagnetization of the maindstatorwinding so-as' to set up a field to compensate said main stator windinganother set of said brushes connected to said source to produce amagnetization at. an angle to the main stator-winding, an auxiliarystator winding connected in circuit with the second set of brushes andarranged to produce a mag netization along the line of the second setof-brnshes, the circuit containing the auxiliary winding and the secondset of brushes being connected in shunt with the main stator winding,and means whereby the ampere turns of the auxiliary winding may bevaried and reversed.

1g." In an alternating currentmotor, in 'combin tion, a stator winding,a"'winding provided with a commutator, brushes bearing on saidcommutator, a set of said brushes connected to a source of cur rent andforming with the rotor w-indin the exciting circuit, a second set of saibrushes forming with said rotor .Winding a circuit compensating thestator winding, the circuit containing the first set-of brushes beingconnected in shunt to said stator wind: ing across said source ofcurrent, and a regulating winding for controlling the self-induction ofthe exciting circuit.

15, In an alterna-tlngicurrent motor, in combination, a stator winding,a rotor haviiig a winding provided with a commutator,

brushes bearing on said commutator, a set of said brushes connected toa-source of current and forming vwith the rotor winding the excitingcircuit, a second set of said brushes forming with said rotor winding acircuit compensating the stator winding, the circuit 'containing thefirst set of. brushes bein g connected in shunt to said stator Windingacross said source of current, and a regulating coil having its magneticaxis arranged along the line of magnetization'of the exciting-circuit.

In testimony whereof We afiix our signatures in presence of twowitnesses. I ENGELBERT ARNOLD, JENS LASSEN LA GOUR. Witnesses to thesignature of E. Arnold: JosnrH SI ON,

.M. SoHUMANN.

Witnesses to the signature of J, la-

Cour:

ALFRED FRAnNoimL, MARTIN Ram. w

